Maybe this old problem topic i had will help. Since this is most likely has to do with the custom vertice structure declaration.
Your error at Line 1021 is here below.
GL.DrawElements(target, indexElementCount, indexElementType, indexOffsetInBytes);
The code can be found here on git hub.
https://github.com/MonoGame/MonoGame/blob/develop/MonoGame.Framework/Graphics/GraphicsDevice.OpenGL.cs